Method for enhancing mechanical properties of aluminum alloy based on ultrasonic cyclic resonance effect

Abstract

The invention provides a method for enhancing mechanical properties of an aluminum alloy based on ultrasonic cyclic resonance effect. The method comprises the steps that an aluminum alloy plate is subjected to water quenching after being subjected to solution treatment, the quenched plate is subjected to ultrasonic cyclic resonance at the room temperature, controlled micro-scale reciprocating displacement motion is induced, and the strength and ductility of the plate are improved. According to the method, the frequency of an ultrasonic generator is controlled to be kept the same as or close tothe inherent frequency of an aluminum alloy material, cyclic resonance occurs to the material, vacancies can be continuously introduced into the material through cyclic resonance, and finely-distributed precipitated phases are dynamically precipitated, so that the mechanical properties of the alloy is enhanced, the aluminum alloy plate has higher strength, the competitiveness of the lightweight aluminum alloy plate and traditional steel is enhanced, meanwhile, the elongation of the aluminum alloy is increased, and wide application of the aluminum alloy in various fields is promoted.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal material processing, and in particular relates to a method for enhancing the mechanical properties of aluminum alloy based on the ultrasonic cycle resonance effect. Background technique [0002] Aluminum and aluminum alloys have been widely used in modern transportation as lightweight materials. Compared with traditional steel, aluminum alloys have low density, excellent corrosion resistance and are easy to recycle. Therefore, the application of aluminum alloys in modern transportation is increasing year by year. However, the strength of aluminum alloy is relatively low compared to other metals, which limits its application range as a structural material. The traditional way to improve the strength of aluminum alloy is to homogenize the aluminum alloy at a certain temperature after casting, and then perform hot / cold deformation. After deformation, these alloys are solution treated and q...

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Problems solved by technology

[0003] There are many problems in the traditional processing method. First, the final shape of the product is fixed after cold deformation. Afterwards, the uneven surface temperature of the sample will cause thermal stress during high-temperature annealing and quenching, which will cause deformation or even cracking of the product.

This phenomenon causes the yield and quality of aluminum alloy products to decrease, and the manufacturing cost to increase

More importantly, compared with other metal structural materials such as steel, the mechanical properties of aluminum alloys prepared by traditional methods are still relatively poor, which also hinders the application range of aluminum alloys as a lightweight material.

The current methods used to improve the strength of aluminum alloys mainly include adding more alloying elements and grain refinement. Although these methods can increase the strength of aluminum alloys, these methods will also increase the manufacturing cost of aluminum alloys, making casting and The difficulty of processing and forming increases, and at the same time, the elongation of aluminum alloy will be greatly reduced

It is precisely because of the above factors that these methods are currently difficult to use on a large scale in the industrial production of high-performance aluminum alloys.

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